Anthropic

The anthropic sub-block configures the Anthropic cloud provider, which serves Claude models.

Fields

The config block is optional. When omitted, the Anthropic SDK reads credentials from the ANTHROPIC_API_KEY environment variable using its standard resolution logic.

params

The params block sets inference parameter defaults for all models under this provider. All fields are optional and support runtime().

For provider-specific options not covered by these fields, such as extended thinking, use the provider_params field of the model override at request time.

Example

providers {
  anthropic {
    models = [
      "claude-haiku-4-5",
      {
        name = "claude-opus-4-7"
        params {
          max_tokens  = 16000
          temperature = 0.8
        }
      }
    ]

    config {
      api_key  = secret(runtime("ANTHROPIC_API_KEY"))
      base_url = runtime("ANTHROPIC_BASE_URL", "https://api.anthropic.com")
    }

    params {
      max_tokens  = 4096
      temperature = 0.5
    }
  }
}

In this example, requests to claude-haiku-4-5 use the provider-level defaults (max_tokens = 4096, temperature = 0.5). Requests to claude-opus-4-7 use its own model-level params instead (max_tokens = 16000, temperature = 0.8).